US3772262A - Process for recovering polymers from organic solutions - Google Patents

Process for recovering polymers from organic solutions Download PDF

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Publication number
US3772262A
US3772262A US00116490A US3772262DA US3772262A US 3772262 A US3772262 A US 3772262A US 00116490 A US00116490 A US 00116490A US 3772262D A US3772262D A US 3772262DA US 3772262 A US3772262 A US 3772262A
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US
United States
Prior art keywords
stripper
solvent
steam
polymer
water
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Expired - Lifetime
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US00116490A
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English (en)
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A Clementi
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SnamProgetti SpA
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SnamProgetti SpA
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
    • C08C2/00—Treatment of rubber solutions
    • C08C2/06—Wining of rubber from solutions
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S159/00—Concentrating evaporators
    • Y10S159/10—Organic

Definitions

  • the operation is carried out by stripping the solventwith live steam, leaving thereb in anaqueous suspension the polymer free of solvent and in form of crumbs.
  • Said simple principle has ditficulties of application owing to the characteristics of the gummy polymers as polybutadiene, polyisoprene and terpolymers.
  • Still another fact has an economical importance in the multiple effect evaporation application.
  • the second stage therefore must operate at pressures higher than the atmospheric one and there is a pressure drop during thedischarge of the polymer to the filtration which is carried out at atmospheric pressure.
  • the boiling water containing the suspension is therefore, during the filtration operation, subjected to a flash which causes the loss of the sensible heat relating to the range of boiling temperatures of the water at the two pressures, said loss being in the range of 200300 KcaL/kg. of polymer.
  • reaction mixture and the water are mixed under vigorous stirring at a pressure in the range from 7 to 35 kg./cm. which pressure is sufiicient to keep the mixture in the liquid state at the operation temperature, indirect heat being at the same time supplied to said mixture up to reach a temperature between 38 and 93 C.
  • the mixture is subjected to a flash down to relative pressure values between 0 and 1 kg./cm. in said way the vaporized solvent together with small unreacted monomer amounts is removed from the flash zone, while the residue is formed essentially of water and polymer crumbs.
  • Said polymeric solution is fed together with water to the first stage, provided with a stirrer; also a stream of steam containing a little solvent coming from the second stage is fed to the first stage after compression.
  • a stream of steam, solvent and unreacted monomer is discharged, said stream being fed to the solvent recovery apparatus; a suspension of water, polymer, small amounts of solvent and not reacted monomer leaves the bottom and, given that the pressure in the first stripping apparatus is higher than in the second one, it spontaneously flows passing through an expansion valve.
  • the working conditions there is a temperature between 90 and 180 C., preferably between 100 and 130 C., and an absolute pressure between 1 and kg./cm. preferably between 2 and 3.2 kg./cm.
  • the second stripping apparatus there is a temperature from 80 to 140 (3., preferably between 100 and 120 C. and pressures lower than the ones existing in the first stripping apparatus by 1-2 kg./cm.
  • thermocompres- SlOIl
  • the second cited method With reference to the second cited method already known in the art, it comprises a first indirect heating stage at high pressure followed by a flash which causes the re moval of most solvent; for this purpose the pressure drop is remarkable; in the process according to the present invention the heating is direct and in the first stage most solvent is stripped; the pressure difference between the two stages serves the purpose of making the polymer flow spontaneously avoiding thereby the use of transferring means.
  • the flash occurring in the second stripping apparatus serves the mere purpose of realizing a thermal recovery.
  • Said polymers can be obtained through reactions of monomers of the same type or of monomers of different type, in particular conjugated dienes having from 4 to 8 carbon atoms.
  • the conjugated dienes which can be used are e.g.: 1,3 butadiene, isoprene, 2,3 dimethylbutadiene, 2 methoxybutadiene, 1,3 hexadiene, 1,3 octadiene and the like.
  • the comonomers containing said group are: styrene, acrylonitrile, methyl acrylate, methyl methylacrylate, vinyl chloride, ethylene, propylene, butene 1 and the like.
  • the polymers are prepared in presence of organic solvents comprising: parafiins, cycloparaflins and aromatic hydrocarbons which are comparatively inert and liquid at the operative conditions;
  • Said solvents are low molecular weight alkanes as propane, butane and pentane; paraifins and cycloparaffins having a higher molecular weight as isooctane, cyclohexane and methylcyclohexane; the aromatic compounds as benzene, toluene and the like.
  • FIGS. 1 and 2 show two possible embodiments of the process according to the present invention: in FIG. 1 steam leaving the second stripper is compressed by means of an ejector; in FIG. 2 the compression is carried out by means of a compressor.
  • the polymeric solution enters, through duct 1, the stripper 3 provided with the stirrer 15; to the stripper 3 through ducts 2 and 12 respectively water and steam are fed; said steam is the one leaving the stripper 7 mixed with live steam coming from the outside.
  • Said steam in one of the two embodiments of the present invention, is compressed in an ejector 11, use being made, as a motive fluid, of live steam coming from the outside through line 17.
  • the steam mixture, leaving theejector 11, is at the same pressure of the stripper 3 towhich said mixture comes through duct 12.
  • 11 indicates a compressor replacing the ejector.
  • an organ 13 controlling the temperature inside the stripper 3 regulates by means of the valve 14 the flow of live steam to the stripper 7; in said way the temperature in 3 is regulated at the desired value by means of the steam amount fed into 7.
  • the organ 19 controlling the pressure regulates the pressure value inside the stripped 7 by means'of the valve 18, changing by means of which the flow of the motive fluid into the ejector 11.
  • What I cla1med 1s 20 stream leaving the first stripper, formed of water, poly- 1.
  • a process for recovering polymers of conjugated diene monomers from organic solutions characterized in that the polymeric solution to be treated is fed to a first stripper'supplying at the same time water and heat by means of steam said first stage being operated at a temperature of between 90 and 150 C. and at absolute pressure between 1 and 5 kg./cm. from said first stage a mixture of steam and solvent is discharged as overhead product and a mixture of polymer crumbs, solvent and water as bottom product; said bottom product is subjected to a flashing before its introduction into the second stripper wherein the pressure is lower than the one of the first stripper by 1-2 kg./cm.
  • thermocompression operation can be carried out either by means of an ejector or by means of a compressor; in the first case the steam necessary to the stripping operation is fed in part to the second stripper and in part to the first one, acting in said way also as a motive fluid.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
US00116490A 1970-02-18 1971-02-18 Process for recovering polymers from organic solutions Expired - Lifetime US3772262A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2074570 1970-02-18

Publications (1)

Publication Number Publication Date
US3772262A true US3772262A (en) 1973-11-13

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Application Number Title Priority Date Filing Date
US00116490A Expired - Lifetime US3772262A (en) 1970-02-18 1971-02-18 Process for recovering polymers from organic solutions

Country Status (21)

Country Link
US (1) US3772262A (ru)
JP (1) JPS502190B1 (ru)
AT (1) AT307725B (ru)
BE (1) BE762922A (ru)
CA (1) CA959197A (ru)
CH (1) CH520716A (ru)
CS (1) CS199229B2 (ru)
DE (1) DE2106797C3 (ru)
DK (1) DK130686B (ru)
ES (1) ES388730A1 (ru)
FR (1) FR2078683A5 (ru)
GB (1) GB1284045A (ru)
HU (1) HU169123B (ru)
LU (1) LU62619A1 (ru)
NL (1) NL164566C (ru)
NO (1) NO138950C (ru)
PL (1) PL70897B1 (ru)
RO (1) RO61957A2 (ru)
SE (1) SE375312B (ru)
SU (1) SU620213A3 (ru)
ZA (1) ZA71660B (ru)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925298A (en) * 1973-04-25 1975-12-09 Grow Chemical Corp Method of making dry pigmented powder paint
US3933574A (en) * 1973-08-07 1976-01-20 Alexandr Fedorovich Zinoviev Method of and device for isolation of rubber-like polymers from hydrocarbon solutions
US3968003A (en) * 1974-08-29 1976-07-06 Shell Oil Company Process of recovering polymers from their solutions
US4168373A (en) * 1975-11-24 1979-09-18 Borden, Inc. Removal of residual vinyl chloride monomer from polyvinyl chloride latex
US4171427A (en) * 1975-05-16 1979-10-16 Hoechst Aktiengesellschaft Process for continuously removing monomers from an aqueous dispersion of a polymer
US4233437A (en) * 1975-06-14 1980-11-11 Chemische Werke Huels Aktiengesellschaft Continuous process for the removal of monomeric impurities from aqueous dispersions of homo- and copolymers of vinyl chloride
US4332933A (en) * 1979-07-02 1982-06-01 Montedison S.P.A. Process for treating olefinic polymers with steam
US4347098A (en) * 1980-08-14 1982-08-31 Phillips Petroleum Company Solvent vapor recovery from a polymer solution
US4408040A (en) * 1981-05-12 1983-10-04 General Electric Company Slurry granulation-steam stripping process for solvent removal
US4411736A (en) * 1980-08-14 1983-10-25 Phillips Petroleum Company Method for vapor recovery from a polymer slurry
US4423207A (en) * 1980-12-18 1983-12-27 General Electric Company Process for recovery of solid thermoplastic resins from solutions thereof in organic solvents
US4504654A (en) * 1981-11-26 1985-03-12 Polysar Limited Polymer recovery
US6172125B1 (en) 1998-03-26 2001-01-09 Solvay S.A. (Societe Anonyme) Process for recycling articles based on vinyl chloride polymers
US6383958B1 (en) 1999-06-18 2002-05-07 David P. Swanson Nonwoven sheets, adhesive articles, and methods for making the same
US6441092B1 (en) 1999-06-18 2002-08-27 3M Innovative Properties Company Wet-stick adhesives
US6518343B1 (en) 1999-06-18 2003-02-11 3M Innovative Properties Company Wet-stick adhesives, articles, and methods
US6624273B1 (en) 1999-03-19 2003-09-23 3M Innovative Properties Company Plasticized acrylics for pressure sensitive adhesive applications
US6652970B1 (en) 2000-07-07 2003-11-25 3M Innovative Properties Company Degradable crosslinkers, compositions therefrom, and methods of their preparation and use
US6855386B1 (en) 1999-03-19 2005-02-15 3M Innovative Properties Company Wet surface adhesives
US20050272914A1 (en) * 2004-06-07 2005-12-08 Mcelvain Robert R Polymer transfer within a polymerization system
US20060173085A1 (en) * 2003-07-15 2006-08-03 Solvay S.A. Method for recovering a polymer in solution
US20060173086A1 (en) * 2003-07-15 2006-08-03 Solvay S.A. Method for obtaining a polymer in a solution
WO2013059549A1 (en) 2011-10-19 2013-04-25 3M Innovative Properties Company Articles with thin melt coatings and methods for making same
WO2021048713A1 (en) 2019-09-09 2021-03-18 3M Innovative Properties Company Coextruded polymeric adhesive article
US11549748B1 (en) * 2021-10-26 2023-01-10 Chevron Phillips Chemical Company Lp Emission free fluff transfer system and integrated nitrogen cycle

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925298A (en) * 1973-04-25 1975-12-09 Grow Chemical Corp Method of making dry pigmented powder paint
US3933574A (en) * 1973-08-07 1976-01-20 Alexandr Fedorovich Zinoviev Method of and device for isolation of rubber-like polymers from hydrocarbon solutions
US3968003A (en) * 1974-08-29 1976-07-06 Shell Oil Company Process of recovering polymers from their solutions
US4171427A (en) * 1975-05-16 1979-10-16 Hoechst Aktiengesellschaft Process for continuously removing monomers from an aqueous dispersion of a polymer
US4233437A (en) * 1975-06-14 1980-11-11 Chemische Werke Huels Aktiengesellschaft Continuous process for the removal of monomeric impurities from aqueous dispersions of homo- and copolymers of vinyl chloride
US4168373A (en) * 1975-11-24 1979-09-18 Borden, Inc. Removal of residual vinyl chloride monomer from polyvinyl chloride latex
US4332933A (en) * 1979-07-02 1982-06-01 Montedison S.P.A. Process for treating olefinic polymers with steam
US4347098A (en) * 1980-08-14 1982-08-31 Phillips Petroleum Company Solvent vapor recovery from a polymer solution
US4411736A (en) * 1980-08-14 1983-10-25 Phillips Petroleum Company Method for vapor recovery from a polymer slurry
US4423207A (en) * 1980-12-18 1983-12-27 General Electric Company Process for recovery of solid thermoplastic resins from solutions thereof in organic solvents
US4408040A (en) * 1981-05-12 1983-10-04 General Electric Company Slurry granulation-steam stripping process for solvent removal
US4504654A (en) * 1981-11-26 1985-03-12 Polysar Limited Polymer recovery
US6172125B1 (en) 1998-03-26 2001-01-09 Solvay S.A. (Societe Anonyme) Process for recycling articles based on vinyl chloride polymers
US6624273B1 (en) 1999-03-19 2003-09-23 3M Innovative Properties Company Plasticized acrylics for pressure sensitive adhesive applications
US6855386B1 (en) 1999-03-19 2005-02-15 3M Innovative Properties Company Wet surface adhesives
US6518343B1 (en) 1999-06-18 2003-02-11 3M Innovative Properties Company Wet-stick adhesives, articles, and methods
US6383958B1 (en) 1999-06-18 2002-05-07 David P. Swanson Nonwoven sheets, adhesive articles, and methods for making the same
US6903151B2 (en) 1999-06-18 2005-06-07 3M Innovative Properties Company Wet-stick adhesives, articles, and methods
US6441092B1 (en) 1999-06-18 2002-08-27 3M Innovative Properties Company Wet-stick adhesives
US6652970B1 (en) 2000-07-07 2003-11-25 3M Innovative Properties Company Degradable crosslinkers, compositions therefrom, and methods of their preparation and use
CN100443531C (zh) * 2003-07-15 2008-12-17 索维公司 回收溶液中聚合物的方法
US7846986B2 (en) 2003-07-15 2010-12-07 Solvay S.A. Method for obtaining a polymer in a solution
US20060173085A1 (en) * 2003-07-15 2006-08-03 Solvay S.A. Method for recovering a polymer in solution
US20060173086A1 (en) * 2003-07-15 2006-08-03 Solvay S.A. Method for obtaining a polymer in a solution
US7790777B2 (en) * 2003-07-15 2010-09-07 Solvay S.A. Method for recovering a polymer in solution
US20060287442A1 (en) * 2004-06-07 2006-12-21 Chevron Phillips Chemical Company Lp Polymer transfer within a polymerization system
US7517947B2 (en) 2004-06-07 2009-04-14 Chevron Phillips Chemical Company Lp Polymer transfer within a polymerization system
US7109290B2 (en) * 2004-06-07 2006-09-19 Chevron Phillips Chemical Company Lp Polymer transfer within a polymerization system
US20050272914A1 (en) * 2004-06-07 2005-12-08 Mcelvain Robert R Polymer transfer within a polymerization system
WO2013059549A1 (en) 2011-10-19 2013-04-25 3M Innovative Properties Company Articles with thin melt coatings and methods for making same
US10005925B2 (en) 2011-10-19 2018-06-26 3M Innovative Properties Company Articles with thin melt coatings and methods for making same
WO2021048713A1 (en) 2019-09-09 2021-03-18 3M Innovative Properties Company Coextruded polymeric adhesive article
US11549748B1 (en) * 2021-10-26 2023-01-10 Chevron Phillips Chemical Company Lp Emission free fluff transfer system and integrated nitrogen cycle
US11815310B2 (en) 2021-10-26 2023-11-14 Chevron Phillips Chemical Company Lp Emission free fluff transfer system and integrated nitrogen cycle

Also Published As

Publication number Publication date
DE2106797C3 (de) 1974-07-18
DE2106797A1 (ru) 1971-09-16
ZA71660B (en) 1971-10-27
NL164566B (nl) 1980-08-15
RO61957A2 (ru) 1977-09-15
DK130686B (da) 1975-03-24
ES388730A1 (es) 1973-05-16
PL70897B1 (ru) 1974-04-30
NL164566C (nl) 1981-01-15
CA959197A (en) 1974-12-10
DE2106797B2 (de) 1973-12-06
HU169123B (ru) 1976-09-28
SU620213A3 (ru) 1978-08-15
NO138950B (no) 1978-09-04
LU62619A1 (ru) 1971-08-19
NL7102190A (ru) 1971-08-20
NO138950C (no) 1978-12-13
JPS502190B1 (ru) 1975-01-24
AT307725B (de) 1973-06-12
CS199229B2 (en) 1980-07-31
CH520716A (fr) 1972-03-31
FR2078683A5 (ru) 1971-11-05
SE375312B (ru) 1975-04-14
BE762922A (fr) 1971-07-16
GB1284045A (en) 1972-08-02
DK130686C (ru) 1975-09-01

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